Transition between the relaxor and ferroelectric states for $(1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3$ with $x=0.2$ and 0.3 polycrystalline aggregates Available to Purchase

The transition between the relaxor and ferroelectric states for $0.8Pb(Mg1∕3Nb2∕3)O3–0.2PbTiO3$ and $0.7Pb(Mg1∕3Nb2∕3)O3–0.3PbTiO3$ polycrystalline aggregates has been studied by measurements of the dielectric and elastic properties as a function of temperature. The ferroelectric to relaxor transition seems to present a regime of ferroelectric fluctuations that is sharply interrupted by the appearance of the polar nanodomains. It also presents thermal hysteresis, not only in the transition temperature, $Tc$⁠, but in the characteristic time scale of the ferroelectric fluctuations that is longer on cooling than on heating. The latter effect is much more significant for $0.8Pb(Mg1∕3Nb2∕3)O3–0.2PbTiO3$ (⁠$Tc=346K$ on heating), than for $0.7Pb(Mg1∕3Nb2∕3)O3–0.3PbTiO3$ (⁠$Tc∼408K$ on heating). This indicates that there is a sharp slowing down of the kinetics of the phase transition below 346 K.